- print_r: documentation ( source)
- array_shift: documentation ( source)
<?php
/*
Challenge 1: Read and write to Test::$secret before it's output.
Rules::
1. No use of Reflection API / runkit extension
2. No stopping execution before Test::run()
3. No Exceptions or PHP errors / warnings notices allowed
4. No redefining $test
Hints:
1. Caesar
2. Magic methods
3. Requires something that became available in PHP 5.4
*/
class Test
{
private $secret = 'Nyy lbhe Onfr ner orybat gb hf.';
private $callback;
final public function run()
{
call_user_func($this->callback);
return $this->secret . PHP_EOL;
}
public function __set($k, $v)
{
$key = $v[($v[$v])]; // $v is some kind of weird array
$value = $v(); // and a callback!
$this->{$key} = $value;
}
}
$test = new Test;
// start editing here
$testArr = (array) $test;
$secret = array_shift($testArr);
echo 'xxx '.$secret.' xxx';
class Obj implements ArrayAccess {
private $t;
public function __construct($t) {
$this->t = $t;
return;
}
public function offsetSet($offset, $value) { return; }
public function offsetExists($offset) { return; }
public function offsetUnset($offset) { return; }
public function offsetGet($offset) {
return 'callback';
}
public function __invoke() {
$tObj = $this->t;
return function(&$tObj) { print_r($t); };
}
}
$obj = new Obj($test);
$test->x = $obj;
// end editing here
echo $test->run();